Lethal Influence of Zinc Exposure to Clarias gariepinus (Burchell, 1822, Pisces, Clariidae)
Journal Title: Journal of Animal Science Advances - Year 2012, Vol 2, Issue 1
Abstract
Acute toxicity of zinc (ZnSO4.7H2O) on Clarias gariepinus (Burchell, 1822) was investigated using toxicity scale of 96hrLC50 values and the quantal response determined by the statistical Probit Analysis Method. Fish species displayed different mortality responses to the varying concentrations of zinc studied (50, 60, 70, 80, 100 and 120mg/l) 96-hour LC50 value for Clarias gariepinus was revealed to be 78.178mg/l. The lower and upper confidence limits for the LC50 were 86.313mg/l and 71.035mg/l, respectively. While asserting the fact that zinc is an important constituent in municipal wastes discharged into freshwater and marine, there is clear indication from our results of the necessity to control the use of this metal. Further toxicity testing approaches on fish will be very useful in assessing possible ecological risk of heavy metals.
Authors and Affiliations
C. D. Ezeonyejiaku , M. O. Obiakor , C. O. Ezenwelu
Keywords
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